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(No Model.) 2 Sheets-Sheet 1. G B; BOOMER.

BOX FUR PRE SSES. No. 314,911.. Patented Mar. 31, 1885.

' (No Model.) 2 Sheets-Sheet 2-.

i G. B. BOOMER.

BOX FOR PRESSES.

No. 314,911. Patented Mar. 31, 1885.

UNITED STATES PATENT (OFFICE.

GEORGE B. BOOMER, OF MOUNT PLEASANT, NEWV YORK.

BOX FOR PRESSES.

SPECIFICATION forming part of Letters Patent No. 314,911, dated March31, 1885.

(No model.)

TOaZZ whom it may concern Be it known that I, GEORGE B. BOOMER, residingin the town of Mount Pleasant, in the county of Westchester and State ofNew York, have invented certain new and useful Improvements in Boxes forPresses, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, making a part of thisspecification. I

My invention relates more particularly to the presses used forextracting oil from oleaginous substances, and to the manner ofconstructing the plates used on the bottom'of the boxes and on the faceof the plungers, and which form the pressing-surface against which thematerial is pressed, and of arranging the frames that secure the clothover the same.

In the accompanying drawings, in which like letters indicate like parts,Figure 1 is a view of the pressing-surface within the box, showing theframe and cloth in position, a part of the latter being removed to showthe arrange ment with the plates P beneath. Fig. 2 is a view of theinner pressing-surface of the box when adapted for two plates, showingone plate in position and on the opposite side the recess in which theplate is placed. Fig. 3 is a view of the under side of one of theplates. Fig. 4: is a sectional view through one of the plates. Fig. 5 isa view of the frame shown in position in Fig. 1. Fig. 6 is a view of thepressing-surface of the box when adapted for one plate, showing theframe and cloth in position. Fig. 7 is a sectional view through Fig. 6.

My improvements are designed to be used on any variety of presses,whether the boxes are arranged horizontally or vertically and whateverthe power employed, and may be used on both the pressing-surfaces of thebox and of the plunger or follower, or on only one,- as desired.

In the usual construction of boxes where plates or their equivalentshave been used on the inner face of the box to form the pressingsurfacc,these plates have been made to cover 'the entire face of the box, andwhen frames have been employed to hold the cloth in place such framesnecessarily rest upon and are attached to the top of the plate or itsequivalent. In this form of construction much difficulty is encounteredin making the frame heavy and thick enough to have the requiredstrength. and yet not have it interfere with the pressing-surface of thebox. If made thin enough to lie close against the plate and notinterfere when the two pressing-surfaces come together, the frame. isnot strong enough to hold the cloth firmly inits place, while if madethick and heavy enough to accomplish that object, it projects too farbeyond the face of the plate and seriously interfere with the action ofthe press.

In my improved construction, by which I overcome this difficulty, I makethe plate smaller or of less extent than the face of the boxand form theframe so as to surround the plate or its equivalent on all sides, bywhich method I am enabled to construct the frame thick and strong-asthick as the plate, if desired-and yet have the top edge of the frameproject but slightly above the upper surface of the plate, or be evenand 011 the same plane with it, as will be fully understood from thedrawings. The plate may be fastened to the face of the box in the usualmanner; but I prefer the method shown in the drawings, where, as will beseen, the plate or plates, in

.case there aretwo, rest in shallow recesses formed in the face of thebox. These recesses, as shown in Fig. 2, are surrounded by the sides BB, and where two plates are used are separated by a middle partition, B,and are made of such a depth that when the plates are placed in the samethey will project above or beyond the sidesB B and partition B, as isseen in Fig. 2 of the drawings. in the recesses in any convenientmanner; but preferably by a screw at each end, so as to be easilyremovable. Over the plates thus secured, and the entire face of the box,is extended the filter-cloth D, Fig. 1, and is held in place by theframe F, (shown detached in Fig. 5,) which closely surrounds the platesand rests on the sides B B and middle partition, 13, shown in Fig. 1.This frame may be just thick enough to correspond with the height of theplates above the'sides B B, so that when in position the top of theframe will be even with the surface of the plates, and the frame Theplates may be secured and plates will present a smooth uniformpressing-surface; or the outer edge and the middle of the centraldivision of the frame may be the thickest, and the sides may be beveledor slope toward the surface of the plates, as is shown in the drawings.This is the preferable form of construction, as when thus made thematerial as it is pressed is forced away from the sides of the boxtoward the plates, and the cake after pressure is thinnest at the edgeand may easily be dislodged from the pressing-surface; and, moreover,when the central division of the frames is made thickest in the middlewith beveled sides, as is shown, the cake after pressure is separated intwo parts in the center and may be more easily dislodged and removedfrom the box. The frame is fastened to the surface of the box by meansof screws, as is seen in Fig. 1, or may be secured in any manner foundconvenient, so as to be readily removable when it is desired to clean orrenew the cloth. As the frame closely surrounds the plates, it stretchesthe cloth tightly over the surface of the latter and holds it firm andin place during the pressing and when the cake is removed after thematerial is pressed.

My improved frame, constructed so as to surround the plate, may be usedequally well when the plate is attached directly on the face of the box,instead of resting in a recess, as described and shown above. In-allcases it is only necessary to arrange the thickness of the frame tocorrespond with that of the plate. The frame, moreover, maybe soconstructed as to secure or hold the plates in position without otherfastening, as by a lip or projection.

My improved method of constructing the frame may be used with any platewhere the cloth is held on by a frame; but I prefer the plateillustrated in the drawings.

As I propose to construct it, the plate is formed of iron or steel, andfor ordinary use about one-fourth of an inch thick, but may vary inthickness and material, as is found desirable. On the upper side of theplate narrow grooves are formed, extending across the face of the platefrom edge to edge. These grooves,which are most conveniently made by amilling-machine,increasein depth from both edges toward the central lineof the plate until they pass entirely through the latter, as is shown inFig. 3, which shows the back or under side of one of the plates. In themiddle or central line of the plate, therefore, the groove extendsthrough the plate from the up per to the lower side, and the lower lineof the groove is V-shaped, as will be understood fromthe cross-sectionof one of the grooves shown in Fig. 4:. The inclination of the bottom orlower line of the grooves from the edge and the length of the slot oropening which passes through the plates is determined by circumstancesand the use for which the press is adapted. The greater the length ofthe slot or perforation, the freer the oil or other liquid will flowthrough the same, and the slot may be as long as is consistent with thestrength of the plate.

In the face of the boxAAa groove or channel, C, Fig. 2, is formedlengthwise of the box, directly beneath the line of openings 1 in theplate for collecting the oil or other materials after the same haspassed through the plate. By thus constructing the plate with groovesacross the face and passing through the same at one part of the plate,as shown, the plate is rendered much stronger than inthe ordinary modeof construction, as the portions of the plates between the grooves areleft intact and of the full thickness where they cross the channel orleader on the face of the platebed, and thus cannot be affected by thepressure brought to bear on them when in use, and the grooves are madeon both sides of the plate at one and the same operation, and alltrouble of making a different set of grooves on the under side of theplate is avoided; and, moreover, on account of the nature and extent ofthe opening through the plate, the liquid passes readily and quicklythrough the same, and its flow is not checked or interfered with. Platesthus grooved and perforated according to my improvement may be used inany construction of box and on any form of press, whether horizontal orvertical, and may be employed whenever plates or their equivalents areused 5 and it is not necessary that the plates should be of the form andconstruction shown in the drawings, as they may be round or of anydesired shape and adapted to any style of press.

\Vhile I prefer the construction and combination of the plates and frameabove described, the two plates may be used by themselves without thecloth and frame, being held in place in the recess in any convenientmanner. In that case the sides B B of the recess and the middlepartition, B, should be high enough to be even with the top surface ofthe plates, and it is evident that my combination of parts may be usedwith plates grooved in any other way than that described. A single platemay also be used, with or without the frame, to cover the face of thebox or plunger. By my improved construction of plate, therefore, Iobtain a stronger and better plate than those commonly used, and bymaking the plates so small that they lie within the sides of the frameany strength required can be given to the frame, and without raising itsinner edge above the level of the plate more than is desired. The clothis also easily and tightly stretched over the surface of the plates andcan be fastened more securely than is possible by the methods now inuse.

WVhat I claim is- 1. In oil-presses, a frame for holding the clothadapted to surround the plate or pressing-surface, as and for thepurposes set forth. 2. In oil-presses, the combination, with aperforated plate or plates, of the frame F for holding the cloth adaptedto surround the plate, as and for the purposes set forth.

3. In oil-presses, the combination, with a 5 perforated plate or platesand recessed box or plunger to receive the same. of the frame F forholding the cloth adapted to surround the plate, as and for the purposesset forth.

4. In oil-presses, a plate having grooves 10 across the surfaceincreasing in depth from the edges and passing through the plate at ornear the center, substantially as described, and for the purpose setforth.

GEO. B. BOOMER.

Witnesses:

F. L. GROSS, JOHN E. LAW.

